Charles j



(No Model.) H

C. JQSCHILLER.

IMPRESSION THROW-OPP FOR PRINTING PRESSES.

Patented Aug. 26 1890.

UNITED STATES PATEN OFFICE.

CHARLES J. SCHILLER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE SHNIEDE \VEND & LEE COMPANY, OF SAME PLACE.

IMPRESSION THROW-OFF FOR PRHT ITING-PRESSES.

SPECIFICATION forming part of Letters Patent No. 434,955, dated August 26, 1890.

Application filed May 13, 1890. Serial No. 351,626. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES J. SCHILLER, a citizen of the United States, residing in the city of Chicago, county of Cook and State of Illinois, have invented certain new and useful Improvements in Impression Throw-Offs for Printing-Presses, of which the following is a specification.

This invention relates to improvements in throw-offs for printing-presses, to enable the operator to prevent an impression at any time during the continuous operation of the machine, and has for its prime object to simplify and reduce the cost of construction of such devices.

Another object is to have an automaticalor self-locking throw-off, so as to dispense with the employment of special lock devices upon the actuating-lever thereof, and also to have connections of such a character as to avoid the constant rocking of the eccentric-shaft in its bearings during the operation of the machine.

These objects are attained by the devices illustrated in the accompanying drawings, in which-- Figure 1 illustrates in diagram a printingpress with a throw-0E mechanism applied thereto embodying my invention, showing the same in position for making an impression; and Fig. 2, a similar view showing parts in position to prevent an impression.

Similar letters of reference indicate the same parts in the several figures of the drawings.

Referring by letter to the accompanying drawings, A indicates the frame of a printingpress of any desired construction; 13, the vibrating pivoted back legs thereof; C,the eccentric-shaft of the back legs; D, the platen, and E the revolving disk connected with the cocentric-shaft O by the pitman F for vibrating the back legs, all of which parts are common to many printing-presses now in use.

Upon the pivot G of the back legs is loosely journaled a double crank-that is to say, a pair of crank-arms II I, rigidly connected together and standing in radial positions oblique to each other, the former of which is connected by a rod J with a radial lug or projection K upon theeccentric-shaft. Theothercrank-arm I is connected by a rod L with one end of the pivoted lever M, the opposite end of which terminates in a handle N in convenient reach of the operator. The pivotal connection between the rod L and the lever is preferablya slot and pin, as shown in the drawings, so that when the press is off impression, as illustrated in Fig. 2, the slight rocking motion of the double crank during the continuous operation of the machine, due to the changes of the relative positions of the centers of the rod J, will not be communicated to the lever so as to slightly vibrate the same, but will be taken up by the slot, and thus permit the lever to remain at a standstill, although no other obj ection than a slight vibration of this lever at this time exists to the use of an ordinary pivotconnection between the rod L and the lever.

As will be seen by an inspection of Fig. 1, when the press is on impression the center of the pivot connecting the rod J with the radial lug or projection on the eccentric-shaft is on a dead-center with the pivots of the pit-man, while the pivot connecting the rod J with the crank-arm II is also on the dead-center with the pivot of said arm and the pivot-connection between the opposite end of said rod and the lug on the eccentric-shaft, so that while in this position the throw-ofi mechanism is automati- 8o cally locked in position against any strain tending to change the position of its parts, and during the Working of the press the axis of the eccentric-shaft and the pivot of the upper end of the rod J move so nearly on concentric arcs of a circle that the eccentric-shaft will remain stationary during the operation of the press so long as it is on impression, and thus avoid the constant rocking and wear of the eccentric-shaft in its bearings.

I-Iaving described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a throw-01f mechanism for printingpresses, the combination, with the pivoted 5 vibrating back legs and the eccentric-shaft thereof, of a double crank loosely journaled upon the pivot of said legs, one arm of which is connected with a radial projection on said shaft, a lever, and a rod connecting one end I00 of said lever with the other arm of the double crank, substantially as described.

2. In a throw-off mechanism for printingpresses, the combination, with the pivoted of, and the radial lug or projection on said shaft, of a double crank having arms of difierent lengths extending obliquely to each other and journaled upon the pivot of said legs, a rod connecting the shorter arm with the projection on said shaft, a pivoted lever terminating at one end in the handle, anda rod connecting the opposite end of said lever with the long arm of the double crank, substantially as described.

CHARLES J. SCHILLER.

\Vitnesses:

R. C. OMOHUNDRO, A. MILO BENNETT. 

